<template>
  <div>
    <div>
      <span v-for="(item, index) in arr" :key="index">
        <input v-model="checked" :value="item" type="checkbox" />
        {{ item }}
      </span>
    </div>
    <div>你选中的元素，累加的值为：{{ sum }}</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      checked: [],
    };
  },
  computed: {
    sum() {
      return this.checked.reduce((sum, current) => {
        return sum + current;
      }, 0);
    },
  },
};
</script>

<style>
</style>